I can't figure out where I can explicitly enable and / or configure sending notification emails to the user when a ticket changes status.

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There is no "change status" alert/notification. You're agent would select a Canned Response when they change the status. (Reply)

    Thanks for your reply ntozier

    So the only notification the ticket owner receives after opening the ticket is from reply posts?

      You can see the User alerts by going to:
      Admin panel -> Settings -> Tickets -> Autoresponder

      New Ticket
      New Ticket by Agent
      New Message
      Overlimit Notice

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